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Tekrarlanan consistent non-locking read'ler ilk böyle okumada (ya da START TRANSACTION WITH CONSISTENT SNAPSHOT ile) oluşturulan snapshot'ı kullanır.",{"id":149,"topic":9,"difficulty":150,"body":151,"options":152,"correct_key":136,"explanation":161},"019f8780-5eda-74b7-b6e0-41738a820231",2,"Bir geliştirici PostgreSQL'den MySQL'e geçiyor ve iki veritabanının da aynı varsayılan isolation davranışına sahip olduğunu varsayıyor. Farkında olması gereken somut fark nedir?",[153,155,157,159],{"key":136,"text":154},"MySQL\u002FInnoDB varsayılan olarak REPEATABLE READ kullanırken, PostgreSQL READ COMMITTED kullanır",{"key":139,"text":156},"MySQL\u002FInnoDB varsayılan olarak READ UNCOMMITTED kullanırken, PostgreSQL REPEATABLE READ kullanır",{"key":142,"text":158},"İkisi de varsayılan olarak READ COMMITTED kullanır, ama MySQL bunu daha katı uygular",{"key":145,"text":160},"İkisi de varsayılan olarak SERIALIZABLE kullanır, ama MySQL bunu session bazında kapatmaya izin verir","InnoDB'nin varsayılan isolation seviyesi REPEATABLE READ, PostgreSQL'inki ise READ COMMITTED'dır. Bu, aynı MySQL transaction'ı içinde tekrarlanan bir SELECT'in, başka transaction'lar arada commit etse bile aynı snapshot'ı görmesi anlamına gelir; PostgreSQL'in varsayılanında ise her ifade en güncel commit edilmiş veriyi görür.",{"id":163,"topic":9,"difficulty":132,"body":164,"options":165,"correct_key":139,"explanation":174},"019f8780-5edb-75b0-8d6b-0bcf7dfc10fc","MySQL'de açık bir transaction'ı doğru şekilde başlatan ifade hangisidir?",[166,168,170,172],{"key":136,"text":167},"BEGIN TRANSACTION WORK;",{"key":139,"text":169},"START TRANSACTION;",{"key":142,"text":171},"OPEN TRANSACTION;",{"key":145,"text":173},"TRANSACTION START;","`START TRANSACTION;` (veya kısaltılmışı `BEGIN;`) MySQL'de açık bir transaction başlatmanın standart yoludur. COMMIT veya ROLLBACK'e kadar o transaction için autocommit'i geçici olarak devre dışı bırakır.",{"id":176,"topic":9,"difficulty":150,"body":177,"options":178,"correct_key":145,"explanation":187},"019f8780-5ee0-754d-a74f-3ace9fb8356a","Yeni bir MySQL oturumunda `autocommit` sistem değişkeninin varsayılan değeri nedir ve ne anlama gelir?",[179,181,183,185],{"key":136,"text":180},"OFF — her ifade açıkça START TRANSACTION\u002FCOMMIT içine alınmalıdır",{"key":139,"text":182},"OFF — ifadeler açık bir FLUSH verilene kadar tamponlanır",{"key":142,"text":184},"ON, ama yalnızca SELECT ifadelerine uygulanır, DML'e değil",{"key":145,"text":186},"ON — session açıkça START TRANSACTION ile başlatılmadığı sürece her tek SQL ifadesi kendi transaction'ı olarak commit edilir","MySQL oturumları varsayılan olarak `autocommit = ON`'dur. Bu, tek başına çalıştırılan her ifadenin (ör. tek bir UPDATE), session açıkça START TRANSACTION ile bir çok-ifadeli transaction başlatmadığı sürece, çalıştıktan hemen sonra otomatik olarak commit edildiği anlamına gelir.",{"id":189,"topic":9,"difficulty":150,"body":190,"options":191,"correct_key":139,"explanation":200},"019f8780-5ee0-7dc6-ba1d-32d7de839c68","InnoDB'de mevcut açık transaction içinde yapılan tüm değişiklikleri geri almak için hangi SQL ifadesi kullanılmalı?",[192,194,196,198],{"key":136,"text":193},"UNDO;",{"key":139,"text":195},"ROLLBACK;",{"key":142,"text":197},"RESET TRANSACTION;",{"key":145,"text":199},"REVERT;","`ROLLBACK;`, transaction başladığından beri yapılan tüm değişiklikleri, InnoDB'nin undo log'unu kullanarak önceki satır versiyonlarını geri getirerek geri alır. `COMMIT;` ise bunun karşıtıdır ve değişiklikleri kalıcı hale getirir.",{"id":202,"topic":9,"difficulty":150,"body":203,"options":204,"correct_key":136,"explanation":213},"019f8780-5ee1-74a6-b268-f9d89cdd6a52","Bir SELECT'in okuduğu satırlar üzerinde exclusive satır kilidi alarak, mevcut transaction bitene kadar başka transaction'ların bu satırları update veya delete etmesini engelleyen SQL ifadesi hangisidir?",[205,207,209,211],{"key":136,"text":206},"SELECT ... 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FOR UPDATE` satırları okur ve üzerlerinde exclusive kilit alır; bu da mevcut transaction commit veya rollback olana kadar başka transaction'ların aynı satırları update, delete etmesini veya (isolation seviyesine bağlı olarak) kilitlemesini engeller.",{"fields":215,"seniorities":391,"interview_shapes":392,"locales":397,"oauth":399,"question_count":402,"coach_enabled":403,"jd_match_enabled":403},[216,241,261,278,302,315,324,343,365,372,378,385],{"key":217,"name_tr":218,"name_en":218,"sort":132,"specializations":219},"backend","Backend",[220,223,226,229,232,235,238],{"key":221,"name":222,"field":217},"general","Genel",{"key":224,"name":225,"field":217},"go","Go",{"key":227,"name":228,"field":217},"python","Python",{"key":230,"name":231,"field":217},"java","Java",{"key":233,"name":234,"field":217},"csharp","C#\u002F.NET",{"key":236,"name":237,"field":217},"nodejs","Node.js",{"key":239,"name":240,"field":217},"php","PHP",{"key":242,"name_tr":243,"name_en":243,"sort":150,"specializations":244},"frontend","Frontend",[245,246,249,252,255,258],{"key":221,"name":222,"field":242},{"key":247,"name":248,"field":242},"javascript","JavaScript",{"key":250,"name":251,"field":242},"typescript","TypeScript",{"key":253,"name":254,"field":242},"react","React",{"key":256,"name":257,"field":242},"vue","Vue",{"key":259,"name":260,"field":242},"angular","Angular",{"key":262,"name_tr":263,"name_en":263,"sort":264,"specializations":265},"fullstack","Fullstack",3,[266,267,268,269,270,271,272,273,274,275,276,277],{"key":221,"name":222,"field":262},{"key":224,"name":225,"field":217},{"key":227,"name":228,"field":217},{"key":230,"name":231,"field":217},{"key":233,"name":234,"field":217},{"key":236,"name":237,"field":217},{"key":239,"name":240,"field":217},{"key":247,"name":248,"field":242},{"key":250,"name":251,"field":242},{"key":253,"name":254,"field":242},{"key":256,"name":257,"field":242},{"key":259,"name":260,"field":242},{"key":279,"name_tr":280,"name_en":280,"sort":281,"specializations":282},"devops-cloud","DevOps \u002F Cloud",4,[283,284,287,290,293,296,299],{"key":221,"name":222,"field":279},{"key":285,"name":286,"field":279},"aws","AWS",{"key":288,"name":289,"field":279},"gcp","GCP",{"key":291,"name":292,"field":279},"azure","Azure",{"key":294,"name":295,"field":279},"kubernetes","Kubernetes",{"key":297,"name":298,"field":279},"terraform","Terraform",{"key":300,"name":301,"field":279},"linux","Linux",{"key":303,"name_tr":304,"name_en":304,"sort":305,"specializations":306},"ai-engineer","AI Engineer",5,[307,308,309,312],{"key":221,"name":222,"field":303},{"key":227,"name":228,"field":303},{"key":310,"name":311,"field":303},"llm-rag","LLM\u002FRAG",{"key":313,"name":314,"field":303},"mlops","MLOps",{"key":5,"name_tr":6,"name_en":316,"sort":317,"specializations":318},"Database",6,[319,320,321,322,323],{"key":221,"name":222,"field":5},{"key":124,"name":125,"field":5},{"key":121,"name":122,"field":5},{"key":117,"name":118,"field":5},{"key":127,"name":128,"field":5},{"key":325,"name_tr":326,"name_en":327,"sort":328,"specializations":329},"mobile","Mobil","Mobile",7,[330,331,334,337,340],{"key":221,"name":222,"field":325},{"key":332,"name":333,"field":325},"ios-swift","iOS (Swift)",{"key":335,"name":336,"field":325},"android-kotlin","Android (Kotlin)",{"key":338,"name":339,"field":325},"flutter","Flutter",{"key":341,"name":342,"field":325},"react-native","React Native",{"key":344,"name_tr":345,"name_en":346,"sort":347,"specializations":348},"security","Güvenlik","Security",8,[349,350,353,356,359,362],{"key":221,"name":222,"field":344},{"key":351,"name":352,"field":344},"appsec","AppSec",{"key":354,"name":355,"field":344},"offensive-pentest","Offensive \u002F Pentest",{"key":357,"name":358,"field":344},"cloud-security","Cloud Security",{"key":360,"name":361,"field":344},"devsecops","DevSecOps",{"key":363,"name":364,"field":344},"blue-team-incident","Blue Team \u002F Incident",{"key":366,"name_tr":367,"name_en":368,"sort":369,"specializations":370},"qa-test-automation","QA \u002F Test Otomasyonu","QA \u002F Test Automation",9,[371],{"key":221,"name":222,"field":366},{"key":373,"name_tr":374,"name_en":374,"sort":375,"specializations":376},"data-engineer","Data Engineer",10,[377],{"key":221,"name":222,"field":373},{"key":379,"name_tr":380,"name_en":381,"sort":382,"specializations":383},"game-dev","Oyun Geliştirme","Game Development",11,[384],{"key":221,"name":222,"field":379},{"key":386,"name_tr":387,"name_en":387,"sort":388,"specializations":389},"ml-engineer","ML Engineer",12,[390],{"key":221,"name":222,"field":386},[14,15,16],{"junior":393,"mid":395,"senior":396},{"questions":394,"median_sec":3},20,{"questions":394,"median_sec":3},{"questions":394,"median_sec":3},[10,398],"en",[400,401],"google","github",21750,true]